Equilibrium constants can be used to calculate the amounts of reactants and products in a chemical reaction that has reached an equilibrium state. At the same time, when reactant and product amounts are known, equilibrium constants can be calculated from that information.
Equilibrium Constant Units
The equilibrium constant is a ratio, and as such it does not really have units; it is only a measure of how one number compares to another. Published equilibrium constant values are usually given without units, or they are given units that are experimentally determined.